U0262Lost Communication With Audio Amplifier B
- Generic OBD-II code · Network
- How the car detects it
- Large sound systems may use a second external amplifier, audio amplifier B. Such amplifiers take part in network traffic: a patent on modular add-on sound systems explains that the factory amplifier decodes gain commands that the head unit sends over the CAN bus, and that a replacement amplifier must therefore understand the maker's bus format, such as GMLAN. No manufacturer documents U0262 publicly or says which speakers B drives. The single-amplifier case shows typical causes: on the 2023 Mazda CX-50, static or silence with U0186:08 (amplifier unreachable) and U2145:08 came from rear harness connectors 0920-114 and 0920-115D that were not locked (SA-058-22). For B, a receiver such as the head unit sets the code once its frames stop. The speakers fed by B fall silent; U0563 means corrupt data.
- What you may notice
- Some speakers silent while others still play
- Static, crackling or sound dropping out
- Likely causes
- LikelyAmplifier connector not locked or pushed back, often in the rear harness
- PossibleAmplifier B without power or ground (own fuse, switched supply)
- PossibleAftermarket audio installation that removed or bypassed the second amplifier
- RareInternal failure of amplifier B
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.